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DEBT - LONG TERM DEBT REPAYMENTS (Details) | 1 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2018 CAD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Aug. 31, 2018 | Aug. 30, 2018 CAD ($) | Jul. 31, 2018 CAD ($) | Jul. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | May 31, 2018 CAD ($) | Apr. 30, 2018 CAD ($) | Apr. 30, 2018 USD ($) | Jan. 31, 2018 CAD ($)
Enbridge Energy Partners, L.P. | 6.50% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 6.50% | 6.50% |
Enbridge Pipelines Southern Lights L L C | 3.98% medium-term note due June 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.98% |  |  |  |
Enbridge Southern Lights L P | 4.014% medium-term note due June 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  | $ 8,000,000 |  |  |  |  |  | $ 9,000,000
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.01% | 4.01% |  |  |  |  | 4.01%
Midcoast Energy Partners, L.P. | 3.56% Senior Notes Due June 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  | $ 75,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 3.56% | 3.56% |  |  |  |  |
Repayments of debt | $ 76,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Midcoast Energy Partners, L.P. | 4.04% Senior Notes Due June 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  | $ 175,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.04% | 4.04% |  |  |  |  |
Repayments of debt | 182,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Midcoast Energy Partners, L.P. | 4.42% Senior Notes Due June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 4.42% | 4.42% |  |  |  |  |
Repayments of debt | $ 161,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Spectra Energy Capitals, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ 64,000,000 | $ 50,000,000 |  |  |  |  |  |  |  |  |  |
Spectra Energy Capitals, LLC | 6.75% Senior Unsecured Notes Due 2032 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  | $ 64,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 6.75% |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Spectra Energy Capitals, LLC | 7.50% Senior Unsecured Notes Due 2038 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  | $ 43,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 7.50% |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 59,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Spectra Energy Capitals, LLC | 5.65% Senior Unsecured Notes Due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  | $ 163,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 5.65% |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 172,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Spectra Energy Capitals, LLC | 3.30% Senior Unsecured Notes Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  | $ 498,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.30% |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 508,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Spectra Energy Capitals, LLC | 6.20% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 272,000,000 |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 6.20% | 6.20% |
Spectra Energy Capitals, LLC | 6.75% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  | $ 118,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 6.75% | 6.75% |  |  |  |  |
Spectra Energy Partners, LP | 2.95% Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 2.95% |  | 2.95% |  |  |  |  |  |  |  |  |
Union Gas Limited | 5.35% Medium-Term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 5.35% | 5.35% |
Union Gas Limited | 8.75% Debenture |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 8750000.00% |  |  |  |  |  |  |  |
Westcoast Energy Inc | 6.9% senior secured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  |  |  | $ 13,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 6.90% |  |  |
Westcoast Energy Inc | 4.34% senior secured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 4.34% |  |  |
Westcoast Energy Inc | 8.50% Debenture |  |  |  |  |  |  |  |  |  |  |  |  |  |
DEBT |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of notes issued |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 8500000.00% |  | 8500000.00% |  |  |  |  |  |  |  |  |

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